Question # 1

Al reacts with caustic soda to form

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Sodium aluminates

Aluminium hydroxide

Aluminium oxide

sodium tetra aluminate

Ortho boric acid on strong beating gives.

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Borax

Boron oxide

Metaboric acid

Tetraboric acid

Lead monoxide is

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Amphoteric

Neutral

Acidid

Basic

Which one of the following elements exhibits s-inert pair effect.

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B

Al

Pb

Sc

The aqueous solution of Borax

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Acidic

alkaline

Amphoteric

manual

Aluminium does not corrode because.

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It is a semi metal

It is a silver shining metal

It does not react with O2

It forms a protective layer of Al2O3

--------------- element forms an ion with charge 3⁺

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Beryllium

Aluminium

Carbon

Silicon

Which of the following elements is not present abundantly in earth's crust

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Silicon

Aluminium

Sodium

Oxygen

A solution of borax in water is.

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Acidic

Alkaline

Neutral

None of these

Corundum is

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Al2O3

Na2AlF6

Quartz

Calcium

Which substance is water repellant and used in ceramic insulators.

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Asbestos

Lead compounds

Silicon carbide

silicones

Chemical composition of colemanite is

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Ca₂B₆O₁₁. 5H₂O

CaB₄O₇. 4H₂O

Na₂B₄O₇.4H₂O

CaNaB₅O₉. 8H₂O

Which substances is called chrome yellow.

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Pb3O4

PbO

2PbCO3.Pb(OH)2

PbCrO4

Boric acid can not be used.

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As antiseptic in medicine

For washing eyes

In soda bottle

For enamels and glazes

Aluminium oxide is.

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Acidic oxide

Basic oxide

Amphoteric oxide

None of these

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